They said something like a 20° reduction, but really when you're talking about the difference between 60C and 40C it's not like you're getting anything out of it. Thermaltake says longevity, but memory is already lifetime guaranteed at the higher temperature.So the memory is cooled by the cold plate through conduction of the two metal plates?
This is quite possibly one of the poorest interfaces there is outside an air-metal interface. The temperature delta won't be that high AND the thermal conductivity will be low. This means the total heat power taken from the memory chips will be minimal.
Thermal Conductivity * delta temp * surface area= Total watts cooling capacity